CN214153051U

CN214153051U - Battery pack

Info

Publication number: CN214153051U
Application number: CN202120114076.2U
Authority: CN
Inventors: 周锦兵; 王昕�
Original assignee: Dongguan Poweramp Technology Ltd
Current assignee: Xiamen Xinnengda Technology Co Ltd
Priority date: 2020-01-17
Filing date: 2021-01-16
Publication date: 2021-09-07
Anticipated expiration: 2031-01-16
Also published as: JP2022526549A; US20220376335A1; AU2021208147B2; EP4080650A1; AU2021208147A1; JP7358499B2; WO2021143886A1

Abstract

The application discloses group battery, including electric core module, two first side covers and two second side covers. The electric core module includes a plurality of electric cores that pile up, and the both ends of the first side of electric core module respectively form a first groove along first direction extension. Along the second direction, the relative both sides of electric core module are located to two first side covers. The first bodies of the two first side covers are approximately parallel to the third direction of the battery cell module, each first side cover is provided with a supporting part, the supporting parts extend from the edges of the first side covers and are approximately perpendicular to the first bodies of the first side covers, the supporting parts are connected with the groove walls of the first grooves of the battery cell module, the second direction is perpendicular to the third direction, and the first direction is perpendicular to the second direction and the third direction at the same time. Along the third direction, the relative both sides of electric core module are located to two second side covers, and two second side covers are roughly parallel to the second direction, and two second side covers are fixed with two first side covers. Utilize to support the portion of holding and imbed first inslot and make electric core module fixed, simple to operate.

Description

Battery pack

Technical Field

The application relates to the field of power supply, in particular to a battery pack.

Background

The traditional battery shell comprises a shell body with an opening at one end and a cover body, wherein a cavity is arranged in the shell body to contain a battery cell or a battery cell module, and the shell body seals the opening so that the battery shell is integrally arranged outside the battery cell module; another kind of battery case of prior art adopts six side covers to enclose respectively and establishes outside electric core module to utilize side cover and electric core module to adopt fastener fixed connection, so that battery case and electric core module relatively fixed, this kind of battery case installation is inconvenient, and the installation effectiveness is unsatisfactory.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is desirable to provide a battery pack with a conveniently mounted cell module.

A battery pack comprises a battery cell module, two first side covers and two second side covers. The battery cell module comprises a plurality of battery cells, and two ends of a first side edge of the battery cell module respectively form a first groove extending along a first direction. Along the second direction, two first side covers are located the relative both sides of electric core module. The first bodies of the two first side covers are approximately parallel to the third direction of the battery cell module. Each first side cover is provided with a supporting part, the supporting part extends from the edge of the first side cover and is approximately perpendicular to the first body of the first side cover, and the supporting part is connected with the groove wall of the first groove of the battery cell module. The second direction is perpendicular to the third direction, and the first direction is perpendicular to both the second direction and the third direction. Along the third direction, two second side covers are located the relative both sides of electric core module, two second side covers are roughly parallel to the second direction, two second side covers with two first side covers are fixed.

According to some embodiments of the present application, the plurality of battery cells are stacked along a first direction, the battery cell module includes a plurality of battery cell supports for accommodating the battery cells, and the first grooves extending along a second direction are respectively formed at two ends of a first side of the battery cell module by the plurality of battery cell supports.

According to some embodiments of the present application, the abutting portion includes a first abutting surface and a second abutting surface that intersect with each other, the first abutting surface abuts against a groove wall of the first groove, and the second abutting surface abuts against a groove wall of the first groove.

According to some embodiments of the present application, a protruding portion is convexly provided at an intersection of the abutting portion and the first body to the cell module.

According to some embodiments of the present application, the battery pack further comprises a first end cap and a second end cap; the first end cover and the second end cover are respectively located on two opposite sides of the battery cell module and are respectively connected with the second side covers.

According to some embodiments of the present application, the battery pack further comprises at least two buffer pads, wherein at least one of the buffer pads is located between the first end cap and the cell module, and the first end cap is connected to the first side cap and presses the buffer pads on the cell module. At least one the blotter is located the second end cover with between the battery cell module, the second end cover connect in first side cover and press hold the blotter on the battery cell module.

According to some embodiments of the application, the first end cap is provided with a first abutment surface for abutting the cushion, the second end cap is provided with a second abutment surface for abutting the cushion, a distance H between the first abutment surface and the second abutment surface satisfies: h-epsilon₁-ε₂. Wherein h is the electric core moldThe height of the stack, and the sum of the heights of all of the cushions between the first and second end caps in their natural state. Epsilon₁And the sum of the deformation of the plurality of battery cells in the battery cell module is obtained according to the service life test. The first end cover and the second end cover respectively apply pressure to the corresponding cushion pad along the direction of cell superposition in the cell module so as to enable the cushion pad to deform under pressure. Epsilon₂The sum of the deformation of all of the cushions between the first and second end caps according to a life test.

According to some embodiments of the present application, the second side cover includes a second body and sliding portions provided at both ends of the body. The first side cover is provided with sliding grooves penetrating through two ends of the first side cover, the two sliding parts slide into the two sliding grooves on the first side cover respectively, and the sliding parts move in a plane perpendicular to the sliding direction and are stopped by groove walls of the sliding grooves.

According to some embodiments of the application, the spout includes first backstop face, second backstop face and the third backstop face that meets in proper order, first backstop face with the third backstop face is used for being located respectively the relative both sides of sliding part, the second backstop face is located the sliding part deviates from one side of second body.

According to some embodiments of the present application, the sliding portion includes an adapter portion and a positioning portion. One end of the switching part is arranged on the second body, and the other end of the switching part extends to one side of the second body. One end of the positioning part is arranged on the switching part, and the other end of the positioning part extends towards one side of the switching part, which deviates from the second body. The positioning part moves to be stopped by the first stopping surface, the second stopping surface and the third stopping surface respectively. The sliding groove further comprises a fourth stopping surface and a fifth stopping surface, the fourth stopping surface and the fifth stopping surface are connected, the fourth stopping surface is opposite to the second stopping surface and used for stopping one side, deviating from the second stopping surface, of the positioning portion, and the fifth stopping surface is used for stopping the second body.

According to some embodiments of the present application, opposite sides of the second body abut the first and second end caps, respectively.

The battery pack is provided with a supporting part through the first side cover, and the supporting part is embedded into the first groove of the battery cell module. The two second side covers are connected with the two first side covers, so that the abutting parts of the two first side covers abut against the two opposite sides of the battery cell module respectively, the battery cell module is fixed in a space formed by the two first side covers and the two second side covers, and the battery cell module is convenient to install and high in efficiency.

Drawings

Fig. 1 is a schematic structural diagram of a battery case according to an embodiment of the present disclosure.

Fig. 2 is an exploded view of the battery case shown in fig. 1.

Fig. 3 is an exploded view of the battery housing shown in fig. 2 from another perspective.

Fig. 4 is a partial structural view of the battery case shown in fig. 1 with the first end cap removed.

Fig. 5 is a schematic structural view of the battery case shown in fig. 1 with the first side cover removed.

Fig. 6 is a schematic structural view of a first side cover in the battery case shown in fig. 1.

Fig. 7 is a schematic structural view of a first side cover in the battery case shown in fig. 1 in another embodiment.

Fig. 8 is a schematic structural view of a second side cover in the battery case shown in fig. 1.

Fig. 9 is a schematic view of the first end cap in the battery case shown in fig. 1.

Fig. 10 is a schematic view of the second end cap in the battery case shown in fig. 1.

Description of the main elements

Battery pack 200

Battery cell module 201

Battery cell support 2011

First groove 2012

Groove walls

2013, 2014

Electric core 2015

Side wall 2016

Battery management system 203

Power key 2031

Input/output port 2032

Electric quantity indicating module 2033

Alarm module 2034

Heat dissipation structure 205

Insulating film 207

Battery case 100

First side cover

10, 10a

The abutting

parts

11, 11a

First abutting surface 111

Second abutting surface 113

First body

12, 12a

The projections 13, 13a

Third abutting surface 131

Chute 14

First stop surface 141

Second stop surface 143

Third stop surface 145

Fourth stop surface 147

Fifth stop surface 149

First connection holes 15, 15a

Second connecting hole 16, 16a

Third connecting hole 18

Groove 19

Enclosing cover 101

Second side cover 20

Second body 21

Sliding part 23

Transfer section 231

Positioning part 233

First end cap 30

First contact surface 31

First mounting

hole

32, 42

Mounting

surfaces

321, 421

Via 33

The reinforcing

ribs

34, 44

Top surface

341, 441

First through hole 35

Partition 351

First aperture 353

Second hole 355

Threaded hole 36

Light hole 37

Second end cap 40

Second contact surface 41

Second through hole 45

Cushions

50, 60

Protective cover 70

Second mounting hole 71

Panel 72

Third mounting hole 721

Handle 73

Hanging ear 80

First fastener 301

Second fastener 302

First direction X

Second direction Y

Third direction Z

The following detailed description will further illustrate the present application in conjunction with the above-described figures.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

As used herein, the terms "substantially", "substantially" and "about" are used to describe and illustrate minor variations. When used in conjunction with an event or circumstance, the terms can refer to instances where the event or circumstance occurs precisely as well as instances where the event or circumstance occurs in close proximity. For example, when used in conjunction with numerical values, the term can refer to a range of variation that is less than or equal to ± 10% of the stated numerical value, such as less than or equal to ± 5%, less than or equal to ± 4%, less than or equal to ± 3%, less than or equal to ± 2%, less than or equal to ± 1%, less than or equal to ± 0.5%, less than or equal to ± 0.1%, or less than or equal to ± 0.05%. For example, two numerical values are considered to be "substantially" identical if the difference between the two numerical values is less than or equal to ± 10% (e.g., less than or equal to ± 5%, less than or equal to ± 4%, less than or equal to ± 3%, less than or equal to ± 2%, less than or equal to ± 1%, less than or equal to ± 0.5%, less than or equal to ± 0.1%, or less than or equal to ± 0.05%) of the mean of the values.

Some embodiments of the present application provide a battery pack, including a cell module, two first side covers, and two second side covers. The electric core module comprises a plurality of electric cores stacked along a first direction, and two ends of a first side edge of the electric core module respectively form a first groove extending along a second direction. Along the second direction, two first side covers are located the relative both sides of electric core module. The first bodies of the two first side covers are approximately parallel to the third direction of the battery cell module, each first side cover is provided with a supporting part, the supporting parts extend from the edges of the first side covers and are approximately perpendicular to the first bodies of the first side covers, the supporting parts are connected with the groove walls of the first grooves of the battery cell module, the second direction is perpendicular to the third direction, and the first direction is perpendicular to the second direction and the third direction at the same time. Along the third direction, two second side covers are located the relative both sides of electric core module, two second side covers are roughly parallel to the second direction, two second side covers with two first side covers are fixed.

The battery pack is characterized in that the first side cover is provided with a supporting part, the supporting part is embedded into the first groove of the battery cell module, the second side cover is connected with the first side covers, and the supporting parts of the first side covers are respectively supported on two opposite sides of the battery cell module, so that the battery cell module is fixed in the battery shell.

Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.

Referring to fig. 1 to 7, an embodiment of the present application provides a battery pack 200. The battery pack 200 includes a cell module 201 and a battery case 100. The battery shell 100 encloses the battery cell module 201 inside the battery shell to achieve a protection effect. The battery case 100 includes two first side covers 10 and a surrounding cover 101.

The enclosing cover 101 includes a first end cover 30, a second end cover 40, and two second side covers 20, where the first end cover 30, the second end cover 40, and the two second side covers 20 are connected to form a substantially annular shell structure, so that the cell module 201 is disposed in the enclosing cover 101. The two first side covers 10 are located on two opposite sides of the cell module 201. The two second side covers 20 are located on two opposite sides of the cell module 201. Each of the first side covers 10 is provided with an abutting portion 11. The abutting portion 11 is embedded in the first groove 2012 of the cell module 201 and abuts against the cell module 201. Specifically, the cell module 201 includes a cell holder 2011 and a cell 2015. The cell holder 2011 is used to fix the cell 2015. The two ends of the battery cell support 2011 are respectively provided with the first groove 2012. The two ends of the enclosing cover 101 are respectively connected to the two first side covers 10, and are enclosed outside the battery cell module 201 with the two first side covers 10, and the battery cell module 201 is fixed in the battery shell 100.

It is understood that, here, the entire battery housing 100 is formed into a sealed structure by the first end cap 30 and the second end cap 40 to accommodate the cell module 201, and in other embodiments, if the usage environment of the battery pack 200 itself includes two end faces for installing the battery pack 200, the battery pack 200 itself may not include the first end cap 30 and the second end cap 40.

Referring to fig. 2, 4 and 6, for convenience of description, a first direction X, a second direction Y and a third direction Z are defined as coordinate axes, which are perpendicular to each other. In the illustrated embodiment, the first direction X is a stacking direction of the plurality of battery cells 2015, i.e., an extending direction of the first groove 2012; the second direction Y is a direction from one of the first side covers 10 to the other of the first side covers 10, and the third direction Z is perpendicular to the second direction Y and the first direction X, respectively.

The first side cover 10 includes a first body 12 and a supporting portion 11, where the first body 12 is substantially parallel to the third direction Z of the battery cell module 201, that is, the first body 12 may have a smaller included angle with respect to the third direction Z, but the first body 12 is substantially parallel to the third direction Z. The supporting parts 11 are respectively disposed at two ends of the first body 12 and extend from the edge of the first side cover 10, and the extending direction of the supporting parts 11 is substantially perpendicular to the first body 12 of the first side cover 10. The extended abutting portion 11 is connected to the surrounding cover 101, so that the first body 12 and the battery cell module 201 are separated by a set distance. The extending direction of the supporting portion 11 is substantially perpendicular to the first body 12, but is not limited thereto. It can be understood that, in other embodiments, an included angle between the extending direction of the supporting portion 11 and the first body 12 may also be other angles larger than 0 ° and smaller than 180 °, as long as the supporting portion 11 can support the groove wall of the first groove 2012 to fix the battery cell module 201.

With continued reference to fig. 4 and fig. 6, the abutting portion 11 includes a first abutting surface 111 and a second abutting surface 113 intersecting with each other. The first abutting surface 111 abuts against the groove wall 2013 of the first groove 2012, so that the cell module 201 is positioned in the second direction Y. The second abutting surface 113 abuts against the groove wall 2014 of the first groove 2012, so that the cell module 201 is positioned in the third direction Z. When the enclosing cover 101 is connected to the two first side covers 10 which are oppositely arranged, the abutting portion 11 and the first groove 2012 are in interference fit, so that the two abutting portions 11 at two sides of the battery cell module 201 abut against and fix the battery cell module 201.

The first side cover 10 protrudes toward the inside of the battery case 100 at the intersection of the first body 12 and the abutting portion 11 to form a protruding portion 13. The protruding portion 13 is provided with a third abutting surface 131 facing one side of the first abutting surface 111. The third abutting surface 131 is substantially parallel to the first abutting surface 111, but is not limited thereto. The third abutting surface 131 is configured to abut against a side wall 2016 of the cell holder 2011, which is connected to the first groove 2012. It is understood that in other embodiments, the third abutting surface 131 may be omitted.

It is understood that, in other embodiments, the first abutting surface 111, the second abutting surface 113, and the third abutting surface 131 may be configured to follow the shape of the cell module 201 to abut against the cell module 201.

Specifically, two second side covers 20 are located on both sides of each first side cover 10 in the third direction Z. Two ends of each second side cover 20 are respectively connected with two first side covers 10. The first end cap 30 and the second end cap 40 are respectively located at two opposite sides of the cell module 201, and are respectively connected to the two first side caps 10. The first end cap 30 and the second end cap 40 are respectively located on two sides of the first side cap 10 along the first direction X.

With continued reference to fig. 5, the battery housing 100 further includes a cushion 50 and a cushion 60. The buffer pad 50 is located between the first end cap 30 and the battery cell module 201. The first end cap 30 is connected to the first side cap 10, and presses the cushion pad 50 on the cell module 201. The buffer pad 60 is located between the second end cap 40 and the cell module 201. The second end cap 40 is connected to the first side cover 10, and presses the cushion pad 60 on the cell module 201.

The cushion 50 and the cushion 60 are made of soft materials such as MPP (a material using modified polypropylene as a main raw material), CR (chloroprene rubber), flame-retardant silica gel or other rubbers.

The blotter 50 with the blotter 60 sets up the both sides of electricity core module 201 on electric core superpose orientation avoid electric core module 201 at both sides heat dissipation fast, the slow drawback of inside middle heat dissipation. Through the blotter 50 with the blotter 60 sets up the both sides of electricity core module 201 in electric core superpose orientation make the heat dissipation of electricity core module 201 is even, the inside temperature difference of electricity core module 201 reduces, improves the life-span of electricity core module 201.

It is understood that in other embodiments, the number of the cushions 50 and/or the cushions 60 can be two or other numbers.

The enclosing cover 101 comprises the first end cover 30 and the second end cover 40 which are connected, and the first end cover 30 can apply pressure to the cushion 50 and the cell module 201 along the first direction X. The second end cap 40 can also be enabled to apply pressure to the cushion pad 60 and the cell module 201 along the first direction X. Since the cushion 50 and the cushion 60 can be deformed by being pressed, a rigid contact which may be caused by a process error can be eliminated.

The uneven expansion of the battery cell 2015 may cause electrolyte loss or electrolyte decomposition in the battery cell 2015, so that the battery cell 2015 may expand and catch fire to cause explosion. Exert pressure to electric core 2015 in the direction of superposition of electric core 2015, can alleviate the inflation phenomenon that has the positive pole to inlay lithium phenomenon and lead to in electric core module 201 charging process, take place unrecoverable inflation when avoiding long-term the use. In the prior art, end plates (not shown) are respectively covered on two sides of the cell module 201, and steel belts (not shown) are tied to the two end plates to apply pressure to the cell module 201, so as to reduce expansion of the cell module 201. This application utilizes first end cover 30 and second end cover 40 to press and holds blotter 50 and blotter 60 to the realization to electricity core module 201 applys the precompression, improves electricity core module 201's charge-discharge stability increases electricity core module 201's cycle life. The battery case 100 eliminates the end plates and the steel bands, reduces costs, facilitates installation, and reduces the size of the battery case 100 in the first direction X.

The first end cover 30, the second end cover 40, the buffer pad 50, the buffer pad 60 and the battery cell module 201 are in interference fit in the first direction X, so that the connection stability of the structure is improved, and damages caused by shaking and the like are avoided.

The first end cap 30 is provided with a first abutment surface 31 for abutment against the cushion 50. The second end cap 40 is provided with a second abutment surface 41 for abutment against the cushion pad 60. The distance H between the first contact surface 31 and the second contact surface 41 satisfies: h-epsilon₁-ε₂. Wherein h is the sum of the heights of the cell module 201, the cushion pad 50 and the cushion pad 60 in a natural state. Epsilon₁The deformation of the cell module 201 is measured according to a life test. Epsilon₂Is the sum of the amount of deformation of the cushion 50 and the cushion 60 between the first end cap 30 and the second end cap 40 as measured by a life test.

Specifically, a life-pre-pressure curve of the battery cell 2015 can be obtained according to a cycle life test of the battery cell 2015, and a peak value of the curve is an optimal initial pre-pressure of the battery cell 2015. Calculating or testing the deformation epsilon corresponding to the battery cell 2015 according to the initial pre-pressure₁₁. The cell module 201 comprises n cells 2015, epsilon₁＝n*ε₁₁. Calculating or testing the deformation epsilon of the cushion pad 50 according to the pre-pressure₂₁. Calculating or testing the deformation epsilon of the cushion pad 60 according to the pre-pressure₂₂。ε₂＝ε₂₁+ε₂₂. The height of the battery cell module 201 in a natural state is h₁The height of the cushion 50 is h in the natural state₂₁The height of the cushion 60 is h in the natural state₂₂，h＝h₁+h₂₁+h₂₂. The first contact surface 31 and theThe distance H of the second contact surface 41 satisfies: h ═ H₁+h₂₁+h₂₂-n*ε₁₁-ε₂₁-ε₂₂。

It is understood that in other embodiments, the height of the cushion 50 and the cushion 60 may be the same.

The deformation amount epsilon₁₁The amount of deformation ε₂₁And the deformation amount epsilon₂₂Is taken at the peak of the life-pre-pressure curve obtained by the cycle life test, where the peak may be approximated in the curve as a range of values on a smooth straight line. Thus, the amount of deformation ε₁₁The amount of deformation ε₂₁And the deformation amount epsilon₂₂A value obtained in a range of values corresponding to the peak value, and accordingly, the distance H between the first contact surface 31 and the second contact surface 41 can be determined according to the deformation amount ε₁₁The amount of deformation ε₂₁And the deformation amount epsilon₂₂Take values within a range of values.

Referring to fig. 4, fig. 6 and fig. 8, the second side cover 20 includes a second body 21 and sliding portions 23 disposed at two ends of the second body 21. Sliding grooves 14 are respectively formed on both sides of the first side cover 10. The slide groove 14 penetrates the first side cover 10 in the first direction X. The sliding groove 14 is disposed on the abutting portion 11, but is not limited thereto. For example, in other embodiments, the sliding groove 14 may be disposed on the protruding portion 13. The two sliding portions 23 of the second side cover 20 slide into the corresponding sliding slots 14 of the two first side covers 10. The sliding portion 23 is stopped by the groove wall of the sliding groove 14 when moving in a plane perpendicular to the sliding direction, that is, the sliding portion 23 is stopped by the groove wall of the sliding groove 14 when moving in the second direction Y and the third direction Z. The sliding portion 23 and the sliding groove 14 are in interference fit, so that the second side cover 20 and the first side cover 10 are relatively and fixedly connected.

It is understood that, in other embodiments, the sliding portion 23 and the sliding groove 14 may also adopt a clearance fit, so that the sliding portion 23 of the second side cover 20 is easily slid into the sliding groove 14, and the first end cover 30 and the second end cover 40 are respectively abutted against the two second side covers 20, so as to fix the second side cover 20 relative to the first side cover 10.

Referring to fig. 6, the sliding groove 14 is a substantially L-shaped groove, but is not limited thereto. Specifically, the sliding chute 14 includes a first stop surface 141, a second stop surface 143, and a third stop surface 145 that are connected in sequence. The first stop surface 141 and the third stop surface 145 are configured to respectively abut against two opposite sides of the sliding portion 23. The second stop surface 143 is configured to abut against a side of the sliding portion 23 away from the second body 21.

The sliding portion 23 includes an adapter portion 231 and a positioning portion 233. One end of the adapting portion 231 is disposed on the second body 21, and the other end extends to one side of the battery cell module 201. One end of the positioning portion 233 is disposed on the adapter 231, and the other end extends toward one side of the adapter 231 departing from the second body 21. The positioning portion 233 abuts against the first, second, and third stop surfaces 141, 143, and 145, respectively. The chute 14 further includes contiguous fourth and fifth stop surfaces 147, 149. The fourth stopping surface 147 is opposite to the second stopping surface 143 and is used for stopping one side of the positioning portion 233 away from the second stopping surface 143. The fifth stop surface 149 is used for stopping the second body 21.

It is understood that, in other embodiments, the second body 21 may also be a flat plate structure, the adapter 231 may also be omitted, and the positioning portion 233 and the second body 21 are coplanar. The sliding groove 14 may be a U-shaped groove, and the fourth and fifth stop surfaces 147, 149 may be omitted. The positioning portion 233 is inserted into the sliding groove 14 of the U-shaped groove structure, and is stopped by a groove wall of the sliding groove 14 when being moved in the second direction Y and the third direction Z.

Both ends of the first side cover 10 are respectively provided with a first coupling hole 15. The first end cap 30 is provided with four first mounting holes 32 and the second end cap is provided with four first mounting holes 42. Each of the first mounting

holes

32 and 42 is opposite to one of the first connection holes 15. The first end cover 30 and the second end cover 40 are respectively fixedly connected to the first side cover 10 by a first fastener 301 passing through the first mounting hole 32/the first mounting hole 42 and being screwed to the first connecting hole 15. The first fastening member 301 is a screw, but is not limited thereto. The first end cap 30 and the second end cap 40 abut the second side cap 20.

The four first mounting holes 32 are distributed around the first side cover 10, but not limited thereto. It is understood that the number of the first mounting holes 32 may be two, six, etc. For example, two first mounting holes 32 are distributed at diagonal positions on the first end cap 30.

The first side cover 10 is manufactured by an aluminum extrusion process, and the second side cover 20 is of a sheet metal structure, but is not limited thereto. For example, the first side cover 10 and/or the second side cover 20 may also be a plastic product manufactured by an injection molding process.

Referring to fig. 2, 9 and 10, the battery pack 200 further includes a battery management system 203. The battery management system 203 is located on a side of the first end cap 30 facing away from the second end cap 40. The battery case 100 further includes a protective cover 70. The protective cover 70 covers the battery management system 203. The first side cover 10 is provided with a second coupling hole 16. The first cap 30 is provided with a via hole 33 opposite to the second connection hole 16. The protective cover 70 is provided with a second mounting hole 71. The protective cover 70, the first end cover 30 and the first side cover 10 are relatively fixed by a second fastening member 302 passing through the second mounting hole 71 and the through hole 33 in sequence and being screwed into the second coupling hole 16. The second fastening member 302 presses the protection cover 70 and the first end cap 30 against the first side cap 10, so as to further secure the connection between the first end cap 30 and the first side cap 10.

It is understood that in other embodiments, the protective cover 70 may be directly attached to the first end cap 30.

The first end cap 30 is provided with a reinforcing rib 34 for improving strength. The mounting surface 321 for mounting the first fastener 301 on the periphery of the first mounting hole 32 is lower than the top surface 341 of the reinforcing rib 34, so that interference between the first fastener 301 and the protective cover 70 is avoided, and the size of the battery case 100 in the first direction X is reduced. The second end cap 40 is provided with a reinforcing rib 44 for enhancing strength. The mounting surface 321 on the peripheral side of the first mounting hole 42 for mounting the first fastener 301 is lower than the top surface 441 of the reinforcing rib 44, reducing the size of the battery case 100 in the first direction X. It is understood that in other embodiments, the reinforcing

ribs

34 and 44 may be omitted.

Referring to fig. 7, in another embodiment, the first side cover 10a has substantially the same structure as the first side cover 10, except that: the first side cover 10a is further provided with a weight-reducing groove 19, a reserved third connection hole 18, and the first connection hole 15a of the first side cover 10a is provided at the connection of the protruding portion 13a and the first body 12 a. The second connection hole 16a, the third connection hole 18 and the groove 19 of the first side cover 10a are sequentially communicated and are provided on the projection 13 a. The first connection hole 15a, the second connection hole 16a, the third connection hole 18 and the groove 19 penetrate the first side cover 10a in the first direction X, respectively.

The bulge 13a reinforces a weak structure, namely, the strength of the joint between the abutting part 11a of the first side cover 10a and the first body 12a, so as to meet the strength requirement of working conditions such as vibration, impact and the like generated in falling and transportation of the first side cover 10 a; the groove 19 removes a portion of the protrusion 13a to reduce the overall weight of the first side cover 10a, thereby optimizing the structure of the first side cover 10 a.

The first connection hole 15a, the second connection hole 16a, the third connection hole 18 and the groove 19 respectively penetrate the first side cover 10a in the first direction X, thereby further reducing the weight of the first side cover 10 a.

In other embodiments, when the first end cap 30 is made of sheet metal, another fastening member (not shown) is screwed into the reserved third connecting hole 18, so that the first end cap 30 is fixed to the first side cap 10. The diameter of the third connecting hole 18 is not larger than that of the first connecting hole 15a, so that the height of the fastener protruding from the first end cap 30, which is connected with the third connecting hole 18, is not larger than that of the first fastener 301.

The first end cap 30 is provided with a first through hole 35. The first through hole 35 is provided with a partition 351 therein. The blocking portion 351 divides the first through hole 35 into a first hole 353 and a second hole 355 which are disconnected. The first aperture 353 and the second aperture 355 allow a plurality of harnesses (not shown) on the battery cell module 201 and the battery management system 203 to pass through, respectively, and implement harness shunting. For example, a strong current wire harness passes through the first hole 353, and a weak current wire harness passes through the second hole 355, thereby reducing interference between the plurality of wire harnesses. For another example, the positive electrode-connected wire harness passes through the first hole 353, the negative electrode-connected wire harness passes through the second hole 355, and the partition 351 increases a safety distance between the wire harnesses in the first hole 353 and the second hole 355, thereby reducing a risk of short circuit.

The first end cap 30 and the second end cap 40 are respectively manufactured by a die-casting process, but not limited thereto. The first end cap 30 has a plurality of threaded holes 36 and a plurality of light holes 37 symmetrically disposed at a plurality of different locations. The threaded holes 36 are used for mounting the battery management system 203. The threaded hole 36 or the light hole 37 is used for attaching a tie or the like.

The second end cap 40 is provided with a plurality of second through holes 45. A heat dissipation structure 205 is installed on a side of the first end cap 30 facing away from the second end cap 40. The first through hole 35 and the second through hole 45 allow gas to pass therethrough. The second through hole 45 and the heat dissipation structure 205 are respectively located at two ends of a diagonal line on the battery cell module 201. The heat dissipation structure 205 is a fan, but is not limited thereto. The cold airflow blown out by the heat dissipation structure 205 enters the inside of the battery case 100 through the first through hole 35, and moves from the first end cover 30 to the second end cover 40, the shortest path of the cold airflow is the diagonal of the cell module 201, so that the cold airflow flows through the position where the central area of the cell module 201 generates heat, and the heat dissipation effect of the cell module 201 is good.

A plurality of electronic components are provided on the battery management system 203. The electronic components include a power key 2031, an input/output port 2032, a power indication module 2033, an alarm module 2034, and the like. The protective cover 70 is a shell structure. A panel 72 is provided on the side of the protective cover 70 facing away from the first end cap 30. The panel 72 is provided with a plurality of the third mounting holes 721. The plurality of third mounting holes 721 correspond to and expose a plurality of electronic components. The panel 72 is lower than the outermost side of the protective cover 70 away from the first end cap 30 to protect the plurality of electronic components of the battery management system 203. The panel 72 is not lower than the outermost side of the power key away from the first end cap 30, so as to avoid mistaken touch of the power key 2031.

The battery management system 203 is covered with an insulating film 207 to be insulated from the inner wall of the protective cover 70.

The protective cover 70 is provided with a handle 73 for carrying. The protective cover 70 is die-cast and integrally formed with the handle 73 to improve the overall strength of the protective cover 70, and the handle 73 is used for carrying the battery case 100. It is understood that in other embodiments, the handle 73 may be omitted.

The battery case 100 further includes a hanging lug 80. The hanging lugs 80 are disposed at both ends of the first end cap 30, and are used to mount the battery case 100 on an external mechanism.

During installation, the cushion 50 is placed between the cell module 201 and the first end cap 30, and a wire harness of the cell module 201 passes through the first through hole 35 of the first end cap 30; the two first side covers 10 are respectively arranged at two sides of the battery cell module 201 and connected with the first end cover 30, and the abutting parts 11 of the two first side covers 10 abut and fix the battery cell module 201; the two second side covers 20 respectively slide along the sliding grooves 14 of the two first side covers 10, so that the two second side covers 20 are respectively disposed on two sides of the cell module 201; the buffer 60 is disposed on a side of the cell module 201 facing away from the buffer 50, and the second end cap 40 is mounted on the first side cover 10, so that the first end cap 30 and the second end cap 40 apply pressure to the buffer 50, the buffer 60 and the cell module 201; mounting the battery management system 203 and the heat dissipation structure 205 on the first end cap 30 and connecting the wire harness; covering the insulating film 207 on the battery management system 203; the protective cover 70 is mounted on the first side cover 10 to cover the battery management system 203, and the hanging lugs 80 are mounted at both ends of the first end cover 30 to connect the battery pack 200 with an external mechanism.

The battery shell and the battery are provided with the abutting parts through the first side covers, the abutting parts are embedded into the first grooves of the battery cell module, and the two first side covers are connected through the enclosing covers, so that the abutting parts of the two first side covers abut against the two opposite sides of the battery cell module respectively, the battery cell module is fixed in the battery shell, and the battery shell is convenient to install and high in efficiency.

Although the present application has been described in detail with reference to preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the present application.

Claims

1. A battery pack, comprising:

the battery cell module comprises a plurality of stacked battery cells, wherein two ends of a first side edge of the battery cell module respectively form a first groove extending along a first direction;

the two first side covers are arranged on two opposite sides of the battery cell module along a second direction;

the first bodies of the two first side covers are approximately parallel to the third direction of the battery cell module, each first side cover is provided with a supporting part, the supporting parts extend from the edges of the first side covers and are approximately perpendicular to the first bodies of the first side covers, the supporting parts are connected with the groove walls of the first grooves of the battery cell module, the second direction is perpendicular to the third direction, and the first direction is perpendicular to the second direction and the third direction at the same time;

two second side covers, along the third direction, two second side covers are located the relative both sides of electric core module, two second side covers are roughly parallel to the second direction, two second side covers with two first side covers are fixed.

2. The battery pack of claim 1, wherein: the battery cell module comprises a plurality of battery cell supports used for accommodating the battery cells, and the two ends of the first side edge of the battery cell module respectively form a first groove extending along the second direction.

3. The battery pack of claim 2, wherein: the supporting part comprises a first supporting surface and a second supporting surface which are intersected, the first supporting surface supports against the groove wall of the first groove, and the second supporting surface supports against the groove wall of the first groove.

4. The battery pack of claim 3, wherein: the intersection of the abutting part and the first body is convexly provided with a protruding part towards the battery cell module.

5. The battery pack of claim 1, wherein: the device also comprises a first end cover and a second end cover; the first end cover and the second end cover are respectively located on two opposite sides of the battery cell module and are respectively connected with the second side covers.

6. The battery pack of claim 5, wherein: the battery cell module further comprises at least two buffer pads, wherein at least one buffer pad is positioned between the first end cover and the battery cell module, the first end cover is connected to the first side cover, and the buffer pads are pressed on the battery cell module; at least one the blotter is located the second end cover with between the battery cell module, the second end cover connect in first side cover and press hold the blotter on the battery cell module.

7. The battery of claim 6A set, characterized in that: the first end cover is provided with a first abutting surface used for abutting against the buffer pad, the second end cover is provided with a second abutting surface used for abutting against the buffer pad, and the distance H between the first abutting surface and the second abutting surface meets the following requirements: h-epsilon₁-ε₂(ii) a H is the sum of the height of the battery cell module and the height of all the cushion pads between the first end cover and the second end cover in a natural state; epsilon₁The sum of the deformation quantities of a plurality of battery cells in the battery cell module is obtained according to a service life test; the first end cover and the second end cover respectively apply pressure to the corresponding cushion pads along the direction of stacking the battery cells in the battery cell module so that the cushion pads are deformed in a compression mode, wherein epsilon₂The sum of the deformation of all of the cushions between the first and second end caps according to a life test.

8. The battery pack of claim 5, wherein: the second side cover comprises a second body and sliding parts arranged at two ends of the second body; the first side cover is provided with sliding grooves penetrating through two ends of the first side cover, the two sliding parts slide into the two sliding grooves on the first side cover respectively, and the sliding parts move in a plane perpendicular to the sliding direction and are stopped by groove walls of the sliding grooves.

9. The battery pack of claim 8, wherein: the spout is including the first backstop face, second backstop face and the third backstop face that meet in proper order, first backstop face with the third backstop face is used for being located respectively the relative both sides of sliding part, the second backstop face is located the sliding part deviates from one side of second body.

10. The battery pack of claim 9, wherein: the sliding part comprises a switching part and a positioning part; one end of the adapter part is arranged on the second body, and the other end of the adapter part extends towards one side of the second body; one end of the positioning part is arranged on the switching part, and the other end of the positioning part extends to one side of the switching part, which is far away from the second body; the positioning part moves and is stopped by the first stopping surface, the second stopping surface and the third stopping surface respectively; the sliding groove further comprises a fourth stopping surface and a fifth stopping surface, the fourth stopping surface and the fifth stopping surface are connected, the fourth stopping surface is opposite to the second stopping surface and used for stopping one side, deviating from the second stopping surface, of the positioning portion, and the fifth stopping surface is used for stopping the second body.

11. The battery pack of claim 8, wherein: the two opposite sides of the second body are respectively abutted with the first end cover and the second end cover.